# SDR ASAA2023082844809

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 28, 2023
- Submitted: August 29, 2023
- Operation: Air carrier
- Aircraft: [N403AS](https://openairdocs.org/aircraft/N403AS), registered now
- Make and model: Boeing 737-900ER
- Registry model: [Boeing 737-900ER](https://openairdocs.org/model/boeing-737-900er) (OpenAirDocs)
- Aircraft serial: 41730
- Aircraft time: 40,330 hours, 12,848 cycles
- System (JASC): [2600 · Fire Protection System](https://openairdocs.org/jasc/2600)
- Part: Detector
- Part number: 90202001
- Condition: Inoperative
- Location: Apu Compartment
- Stage of operation: NR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023082844809

## Discrepancy

APU DET INOP LIGHT ILLUMINATED & APU FIRE HANDLE LIGHT DOES NOT COME ON. GROUNDED - YES. REVERSED MAINT PROCEDURE, FOUND FIRE/ OVHT CONTROL MODULE FAULTING WIRING OPEN OR DETECTOR FAULT. REF SSM 26-11-31 CHECKED RESISTANCE OF M1755 AND M1756 CHECK OK. FOUND M1925 HEAVILY CORRODED. STUD TWISTED OFF DETECTOR WHEN ATTEMPTING TO REMOVE NUT. REMOVED AND REPLACED M1925 REF AMM 26-15-01. 3 MIG-51A TAGS INSTALLED AND REMOVED. NO DEFECTS NOTED TO RING TERMINALS AT CONNECTION T/1 FOR M1925. APU FIRE DETECTION OPERATIONAL TEST PASS REF AMM 26-15-00. MEL 26-8D CLEARED. PLACARDS REMOVED. SEAMC SCOTT NOTIFIED.

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